Device Tags represent instruments, valves, and other field devices. A DST consists of a Device Tag and a specific signal from that device. The licenses purchased with the system determine the number and types of DSTs allowed by the system.
DSTs in DeltaV controllers are identified based on the manner in which the application is configured. Function blocks are grouped into modules. Inputs and outputs from Classic I/O, Serial I/O, Profibus I/O, AS-Interface I/O, and DeviceNet I/O referenced by the function blocks are DSTs.